// Copyright (c) 2015-2019 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.

#include <bench/bench.h>

#include <crypto/sha256.h>
#include <key.h>
#include <util/strencodings.h>
#include <util/system.h>

#include <memory>

static const int64_t DEFAULT_BENCH_EVALUATIONS = 5;
static const char *DEFAULT_BENCH_FILTER = ".*";
static const char *DEFAULT_BENCH_SCALING = "1.0";
static const char *DEFAULT_BENCH_PRINTER = "console";
static const char *DEFAULT_PLOT_PLOTLYURL =
    "https://cdn.plot.ly/plotly-latest.min.js";
static const int64_t DEFAULT_PLOT_WIDTH = 1024;
static const int64_t DEFAULT_PLOT_HEIGHT = 768;

static void SetupBenchArgs() {
    gArgs.AddArg("-?", "Print this help message and exit", false,
                 OptionsCategory::OPTIONS);
    gArgs.AddArg("-list",
                 "List benchmarks without executing them. Can be combined "
                 "with -scaling and -filter",
                 false, OptionsCategory::OPTIONS);
    gArgs.AddArg(
        "-evals=<n>",
        strprintf("Number of measurement evaluations to perform. (default: %u)",
                  DEFAULT_BENCH_EVALUATIONS),
        false, OptionsCategory::OPTIONS);
    gArgs.AddArg("-filter=<regex>",
                 strprintf("Regular expression filter to select benchmark by "
                           "name (default: %s)",
                           DEFAULT_BENCH_FILTER),
                 false, OptionsCategory::OPTIONS);
    gArgs.AddArg(
        "-scaling=<n>",
        strprintf("Scaling factor for benchmark's runtime (default: %u)",
                  DEFAULT_BENCH_SCALING),
        false, OptionsCategory::OPTIONS);
    gArgs.AddArg(
        "-printer=(console|plot)",
        strprintf("Choose printer format. console: print data to console. "
                  "plot: Print results as HTML graph (default: %s)",
                  DEFAULT_BENCH_PRINTER),
        false, OptionsCategory::OPTIONS);
    gArgs.AddArg("-plot-plotlyurl=<uri>",
                 strprintf("URL to use for plotly.js (default: %s)",
                           DEFAULT_PLOT_PLOTLYURL),
                 false, OptionsCategory::OPTIONS);
    gArgs.AddArg(
        "-plot-width=<x>",
        strprintf("Plot width in pixel (default: %u)", DEFAULT_PLOT_WIDTH),
        false, OptionsCategory::OPTIONS);
    gArgs.AddArg(
        "-plot-height=<x>",
        strprintf("Plot height in pixel (default: %u)", DEFAULT_PLOT_HEIGHT),
        false, OptionsCategory::OPTIONS);

    // Hidden
    gArgs.AddArg("-h", "", false, OptionsCategory::HIDDEN);
    gArgs.AddArg("-help", "", false, OptionsCategory::HIDDEN);
}

int main(int argc, char **argv) {
    SetupBenchArgs();
    std::string error;
    if (!gArgs.ParseParameters(argc, argv, error)) {
        fprintf(stderr, "Error parsing command line arguments: %s\n",
                error.c_str());
        return EXIT_FAILURE;
    }

    if (HelpRequested(gArgs)) {
        std::cout << gArgs.GetHelpMessage();
        return EXIT_SUCCESS;
    }

    int64_t evaluations = gArgs.GetArg("-evals", DEFAULT_BENCH_EVALUATIONS);
    std::string regex_filter = gArgs.GetArg("-filter", DEFAULT_BENCH_FILTER);
    std::string scaling_str = gArgs.GetArg("-scaling", DEFAULT_BENCH_SCALING);
    bool is_list_only = gArgs.GetBoolArg("-list", false);

    double scaling_factor;
    if (!ParseDouble(scaling_str, &scaling_factor)) {
        fprintf(stderr, "Error parsing scaling factor as double: %s\n",
                scaling_str.c_str());
        return EXIT_FAILURE;
    }

    std::unique_ptr<benchmark::Printer> printer =
        std::make_unique<benchmark::ConsolePrinter>();
    std::string printer_arg = gArgs.GetArg("-printer", DEFAULT_BENCH_PRINTER);
    if ("plot" == printer_arg) {
        printer.reset(new benchmark::PlotlyPrinter(
            gArgs.GetArg("-plot-plotlyurl", DEFAULT_PLOT_PLOTLYURL),
            gArgs.GetArg("-plot-width", DEFAULT_PLOT_WIDTH),
            gArgs.GetArg("-plot-height", DEFAULT_PLOT_HEIGHT)));
    }

    benchmark::BenchRunner::RunAll(*printer, evaluations, scaling_factor,
                                   regex_filter, is_list_only);

    return EXIT_SUCCESS;
}
